Method of forming closures for paper receptacles.



E. F. HULBERT.

METHOD or :FORMING CLOSURES FOR PAPER RECEPTACLES.

V APPLICATION FILED AUG-17.1916- I 1,249,095, Patented Dec. 4, 1917.

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METHOD OF FORMING CLOSURES FOR PAPER RECEPTACLES. APPLICATION mm AUG-11. 1916.

1,249,095.. Patented Dec. 4,1917.

2 SHEETS-SHEET 2- VIII q 5 llllllll IIIIIII [1 111111111111]:

s imx 'IIIIIIIIIIIIllIIIIIIIIIIIIlIII/IIIIIIIIII EDWIN F. HULBERT, 0FMILWAUKEE, WISCONSIN, ASSIGNOZB. T0 NATIONAL PAPER CAN COMPANY, OFMILWAUKEE,

WISCONSIN, A CORPORATION OF DELAWARE.

METHOD OF FORMING GLOSURES FOR PAPER RECEPTACLES.

Original application filed December 1, 1913, Serial No. 803,914. Dividedand this application filed August 17,

Specification of Letters Patent.

Patented Dec. 4:, 11917.

1916. Serial No. 115,388.

To all whom it may concern:

Be it known that I, EDWIN F. HULBERT, a citizen of the United States,residing at Milwaukee, Milwaukee county, Wisconsin, have invented a newand useful Improvement in the Methods of Forming Closures for PaperReceptacles, of which the followingis a full, clear, and exactdescription, reference being had to the accompanying drawings, formingpart of this specification, in which Figures 1, 2, 3 and 5 are verticalsections of a portion of a receptacle illustrating different steps inthe formation of the closure;

Fig. 4 is a perspective view of one of the caps removed; 7

Fig. 6 is a vertical sectional view'showing a modification;

Fig. 7 is a side elevation, partly in section, illustrating a, furtherfeature which I prefer to employ; and

Fig. 8 is a plan View, partly broken away, showing the form of Fig. 7.

This application is a division of my copending application, Serial No.803,914, filed December 1, 1913.

The object of my invention is to provide a strong and tight closure forpaper cans of round, square, rectangular or other form, without the useof wax, cement or other coating, the closure being secured wholly bymechanical means.

Referring to the accompanying drawings,

' Fig. 1 shows the first step in the operation of forming the closure.In this figure the numeral 2 designates a portion of the body of thepaper receptacle, and 3 a disk of paper or other suitable material andhaving a right-angled flange 4. This'disk is forced into the end portionof the body of the receptacle to any desired distance, which may varyfrom that flush with the edge up to a distance twice the depth of theflange 4, or any other desirable distance, as shown in Fig. 1, with theflange projecting outwardly. The upper edge portion 5 of the body of thereceptacle is then curled or pressed inward anddown over the flange 4and substantially parallel therewith, as shown in Fig. An annulardepression or bead 6 (Fig. 3) 1s then rolled or pressed into thetriple-ply wall thus formed. In forming this head, the disk or cap 3 isexpanded and firmly locked in the wall of the receptacle, being held notonlyv groove formed in the said body, the engagement therewith of formedin the folded body portion take a flat blank, such as shown at 7 in Fig.4, of paper or other suitable material, and force this into the end ofthe receptacle until its peripheral edge snaps into the annulardepression 6, as shown in Fig. 5, the disk being preferably dished; Assesses some resiliency, its natural tendency is to resume its originalfiat form. This causes it to exert an outward radial pressure at itsperipheral edge which acts to firmly pinch the flange 4: between thelocking portions of the body. The parts are, in this manner, so tightlyseated that when pressure is applied, either inwardly or outwardly onthe closure, it remains locked firmly in position.

Fig. 6 shows a modified form or closure particularly adapted as a topclosure, to per- Init access to and the removal of the contents of thereceptacle. This form is constructed the same as that first described,except that the inner cap or disk 3 is formed with a central opening 8,and the outer cap or disk 7 is formed with a centrally depressed portion9, which fits within and closes the said central opening.

As shown in the preferred form of Figs. 7 and 8, I form a seat for theinner cap or disk 3 by means of a series of indentations or crimps 10which are pressed into the body of the Vessel at spaced apart pointsaround the circumference. By forming these as separate indentations,instead of a circular but also by the bead 5. Inext groove, I avoidweakening the receptacle against endwise pressure while obtaining theseat for the disk.

The unbent portions of the receptacle wall between the indentations 10serve like struts to prevent the bead formed by the indentations fromcollapsing under pressure or flattening under tension as it would be,likely to do if the bead were formed of a continuous circular groove inthe wall, especially if the paper become at all softened by liquid.

The advantages of my invention will be apparent from the foregoing,since it provides a closure for paper receptacles which is strong andtight Without the use of wax, cement or other coating to secure it inplace and seal the joints.

This can will withstand considerablethis disk pos-' shocks and blowswhich may be given it during shaping or otherwise, on account'of thestrength of the brace joint closure.

Various changes may be made in the can,

the caps, etc., without departing from my 1. The herein described methodof forming a closure for a paper can or receptacle,

' WhiCll'COIlSlStS'lll forcing into the end portion thereof a closuremember having an outwardly turned peripheral flange, then turning theend portion of the body of the receptacle downwardly and inwardly overthe edge of said flange and within the same, then forming a locking beadin the triple wall previously formed, and finally forcing into the endportion of the receptacle an auxiliary cap or closure of larger diameterthan the inner diameter of the said triple -wall, and causing its edgeto engage with the said groove; substantially as described.

2. The herein described method of forming a paper can or receptacle,which consists in forcing into the end of the-body portion thereof aclosure member having an outwardly turned peripheral flange, thenturning the end of the body portion downwardly and inwardly over theedge of said flange and within the same, and finally forcing into theend portion of thearticle an auxiliary cap or closure of larger diameterthan the inner diameter of the triple wall, and cansing its edge toexert an outward locking pressure thereon; substantially as described.

3. The herein described method of forming a paper can or receptacle,which consists in forming a seat or bead on the body portion by forminga series of indentations which are spaced apart and separated bystrut-like unbent portions of the body wall and in inserting'in the endof the body portion a closure member and seating it against such head orseat, substantially as described.

4. The method of forming a paper can or receptacle, comprising the stepof forming a seat or bead ontlie body portion by pressing therein aseries of indentations whic are spaced apart and separated by strut-likeunbent portions of the body wall.

In testimony whereof, I have hereunto set my hand.

EDWIN F. HULBERT.

